Motor driven pumps



Dec. 29, 1964 H. T. WHITE MOTOR DRIVEN PUMPS Filed Nov. l0

INVENTOR. HOWARD T. WH TE ATTORNEY United States Patent 3,163,790 MGTR BRN/'EN PUMPS Howard T. White, Melrose Park, lia., assigner to Fostoria Corporation, tlnrrington, ia., a corporation i @hic Filed Nov. lo, 196i, Ser. No. iSLStl ie claims. (ci. sro-sfo rl`his invention relates to motor driven pumps and more particularly to improved cooling provisions therefor.

In the operation of motor driven pumps, particularly for pumping uids at elevated temperatures it is necessary to prevent excessive temperatures being attained in the motor stator windings as Well as in the mot-or bearings. it has heretofore been proposed to provide a jacket around the motor stator to cool the same and to circulate huid around the `bearings and in the clearance space between the motor stator and the motor rotor. No wholly satisfactory provisions have heretofore been made for cooling this circulating tluid.

It is the principal object of the present invention to provide an improved motor driven pump for operation kat high temperatures with internal circulation of cooling fluid.

It is a further object of the present invention to provide a motor driven pump for high temperature duid pumping having a heat exchanger of simple but eileetive type incorporated therein for cooling internally circulated cooling fluid.

lt is a further object ot the present invention to provide a motor driven pump for high temperature fluid pumping having a heat exchanger incorporated therein tor cooling internally circulated cooling fluid in which the heat exchanger can be built as a unit and on a motor housing end closure for easy assembly and disassembly.

It is a further object of the present invention to provide a motor driven pump for high temperature tluid pumping having provisions for circulatingy an internal cooling fluid which can, if desired, be separated from the iluid being pumped and which can be 'cooled by another fluid in heat exchange relation therewith.

Other objects and radvantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description, taken in connection with the accompanying drawings forming part thereof, in which:

FIG. 1 is a view partly in elevation and partly in vertical section ofa preferred form of motor driven pump in accordance with the invention;

HG2 is fragmentary transverse vertical sectional View taken approximately on the line 2 2 of FiG. l;

FG. 3 is a transverse vertical section taken approximately on the line 3-3 of PIG. l, and

FG. 4 is an enlarged fragmentary view partly in elevation and partly in longitudinal section ot a heat exchanger tube and its tins `as employed in connection with the invention.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modilications and changes may be made in the structure disclosed Without departing from the spirit of the invention.

Referring now more particularly'to the drawings, a pumphousing l@ is provided, of generally cylindrical shape and having in the interior thereof a pump chamber 11. Afiuid inlet connection l2 is provided, at the center ICC The pump housing l@ has an end closure plate 14 with an annular recess l5 which is held in assembled relation to a shoulder le on the pump housing lt) by bolts 17 which extend into blind threaded holes iti in the pump housing lli?. An annular packing 20 can be provided for preventing fluid leakage.

The end closure plate ld has a hollow cylindrical neck 2l secured thereto in any desired manner, such as by welding, and the neck Trl extends into and beyond an end mounting plate 22 to which it is secured in any desired manner, such as by welding.

The motor housing includes an outer cylindrical motor housing section 2S with opposite motor housing end closure plates 26 and 257 secured thereto in any desired manner, such as by welding. The end closure plates 26 and 2"/ have central openings 2d for the reception of the ends of a cylindrical sleeve dii which are secured thereto in iiuid tight relation in any desired manner, such as by welding. The sleeve 3i) is of non-magnetic responsive material, such as Stainless steel, and serves with the housing section and the end closure plates 26 and 27 to provide an externally disposed isolated motor stator chamber 35i, and also to provide an interior motor rotor chamber Z9.

A motor stato-r winding 32 and stator laminations 33 can be provided on the sleeve 3). Reinforcing and strengthening rings 3d can be provided on the sleeve Si@ between the laminations 33 and the plates 26 and 27.

The winding 32 can be connected `by conductors 3S which extend through a sealed connector 36 to any suitable source of alternating current.

The mounting plates 22 and neck 21 have the end closure plate 26 secured in position with respect thereto by bolts 37 which extend into blind holes 33 in the end closure plate 2d. A packing 39 can be provided between the plates 22 and 2d for preventing iluid leakage at this location.

The end closure plate 27 has secured in position with respect thereto a heat exchanger mounting plate 4l? which is seated in a groove 4i in the plate Z7 and has a collar portion d2 extending within the sleeve 3d. The mounting plate iii is heid inposition by a holding ring d3, a packing 44 being interposed between the plate 4tland the ring d3. A plurality of bolts i5 extending through the ring 43 and into engagement in blind threaded holes 46 in the plate 27 retain the ring 43, packing eiland plate lil in position.

The neck 2l has in the interior la bearing sleeve 47 which includes an outer metal collar iti and inner cylindrical bearing collar i9 of carbon `or the like. The sleeve d'7 is retained in position `by a set screw 5@ and has a plurality of longitudinal slots 5l and radial end passageways 52 communicating therewith for fluid ow.

The mounting plate iii also has a bearing sleeve 53 which is retained position against a shoulder 54 by a set screw f A hollow shaft d@ is provided journalled in the bearing sleeves i7 and 53 and has a uid impeller 61 secured thereto and disposed in the impeiler chamber ii. The

end ot the shaft d@ in the impeller chamber 11 is preferably closed by a plug d2. l

The shaft dit' in the motor rotor chamber has a motor rotor ed secured thereto ytor rotation therewith. The motor rotor can be ot the short circuited type and is preferably enclosed within a fluid tight enclosure 65 which is secured to the shaft tid.

. between the rotor enclosure 65 and the sleeve Btiy serves' of the'housingiii and longitudinally axially thereof, comfor cooling fluid ilov/ as hereinafter explained.

The shaft oil, at the outer end of the bearing sleeve d'1 has one or more openings d'7 therethrough for uid delivery to the radial end passageways 52 and slots di and an impelier ring d@ is mounted on the shaft dit at The clearance at 6o therein,

a the inner end of the bearing sleeve (i7, and against a Shoulder 69 on the shaft 6?. The ring 68 has a plurality of radial openings 70 for fluid discharge and for effecting cooling fluid flow.

The heat exchanger mounting plate 4d has a heat exchanger casing 72 preferably of cylindrical shape secured thereto in any desired manner, such as by welding. The casing 72 is closed at the outer end thereof by an end plate 73.

ln the interior of the casing 72 a baffle 7d is provided which extends from the end plate 73 toward but terminates at a marginal edge 75 spaced from the mounting plate liti. The baille 74 divides the interior of the casing 72 into two chambers 76 and 77, one of which such as the chamber '76 has a cooling fluid inlet connection 78, mounted on the end plate 73, connected thereto while the other chamber 7'7 has a cooling fluid delivery connection 79, mounted on the end plate 73, connected thereto. The fluid delivery connection 79 is connected by a pipe Sil to a fluid connection 8l communicating with the interior of a cylindrical jack-et SZ mounted on the exterior of the motor housing section 25.

Within the interior of the jacket 82 a longitudinal baille 83 is provided closely spaced with respect to the fluid connection 3l and for directing fluid around the interior of the jacket S2 for discharge through a discharge fluid connection S4 on the other side of the baille S3.

The mounting plate 4d has extending therefrom and within the interior of the heat exchanger casing 72 a plurality of heat exchange tubes Sd of U-shape, each of which is provided along its length except at the turns with metal fins S7 for increasing the heat transfer action One of the tubes 36 has an inlet connection 88 and outlet connection 89 through the mounting plate d0, and both on one side of the baffle plate 74 and the other tube 36 has an inlet connection 90 and outlet connection 91 through the mounting plate 4G and both on the other side of the baffle plate 74. The inlet connections 8S and 90 are in communication with the motor rotor chamber 29. The fluid delivery connections S9 and 91 are in communication through a connecting passageway 92 with the interior of the shaft 60 for fluid flow.

If desired, the neck 2 can have a filling fluid passageway 93 with a filling connection 94- communicating therewith. The filling connection 94 is preferably provided with a shut-oil valve 95 for controlling the supply of fluid through the connection 94.

The mode of operation will now be pointed out.

rfhe energization of the winding 32 is effective for establishing a rotating field in the stator laminations 33 which is effective for rotating the motor rotor 64 and the shaft 60 secured thereto. Rotation of the shaft 60 is effective for rotating the impeller 6l in the impeller chamber lll for the delivery of fluid from the fluid inlet connection l2 to the fluid delivery connection 13.

Rotation of the shaft oli is also effective for rotating the impeller ring 58 so that fluid entering the opposite end of the shaft o@ is delivered through the shaft of), the openings 67, the passageways 52 and slots 5l to the impeller ring titi and through the ring holes 70 to the motor rotor chamber 29 and thence through the clearance space 66 between the motor rotor enclosure 65 and the sleeve 3f), thence through the inlet connections 33 and il@ to the interiors of the tubes du for cooling prior to its return through the delivery connections 89 and 9i to the end of the shaft 50.

lt will be noted that the fluid in the course of its circulation is in'heat exchange relation for cooling to the bearing sleeve 53, in cooling relation to the interior of the motor rotor 54, in cooling relation to the bearing sleeve 50, in cooling relation to the exterior of the motor rotor 64 and in cooling relation to the sleeve 3d interiorly of the laminations 33, this fluid passes for cooling to and through the heat exchange tubes 86. A continuous l closed circuit for cooling fluid is thus provided which can be independent of the fluid being pumped by the impeller of.

The heat exchange tubes 36 are cooled on the exteriors thereof by another cooling fluid introduced through the fluid inlet connection 78 on the end plate 73 which fluid passes in heat exchange relation first with one of the tubes 86, `then around the end margin 75 of the baille 74, then in heat exchange relation with the other of the tubes Se, then through the fluid delivery connection 79 on the end plate 73, through the pipe 80 to the fluid connection 3l on the exterior of the jacket 82, then Within the interior of the jacket 82 as required by the baille d3 to the fluid discharge connection 84 for discharge.

lt will be noted that the heat exchanger comprises a removable unit which can be readily installed and disassembled if desired or required for inspection of the interior of the motor rotor chamber 29. At the same time the heat exchange unit is effective for providing the desired cooling action of the motor and preventing excessive temperature rise therein even with Very high temperature fluid pumped through the impeller chamber l1.

The construction of the neck 2l with a restricted amount of material between the end closure plate 1d and the bearing sleeve Sl reduces the amount of metal for heat transfer from the pump to the motor and further aids in avoiding any undue temperature rise in the stator windings 32, motor rotor 64, and bearing sleeves 47 and 53.

I claim:

1. A heat exchange systemfor a motor driven pump having a motor housing with a cylindrical sleeve longitudinally axially mounted therein and separating a motor stator chamber from an interior motor rotor chamber, a motor rotor in said motor rotor chamber having a clearance with respect to said sleeve for cooling fluid flow, a shaft on which said motor rotor is mounted, said shaft having a central longitudinal passageway therein for cooling fluid flow, a motor housing closure at one end of said sleeve having a bearing for said shaft, a heat exchanger mounted on and longitudinally axially disposed with respect to said motor housing closure having heat exchange elements therein -in communication with said motor rotor chamber and with the interior of said shaft longitudinally through said motor housing closure, a fluid connection for supplying fluid for cooling said heat exchange elements, a fluid delivery connection for the delivery of cooling fluid from said heat exchanger, and members interiorly disposed in said sleeve and contiguous to the other end of said sleeve for impelling fluid in said clearance and through said exchange elements and said shaft passageway.

2. The combination as dened in claim 1 in which said impelling members include an auxiliary impeller on said Yshaft in said motor rotor chamber in communication with said shaft passageway for circulation of the cooling fluid.

3. The combination as defined in claim 2 in which a radial bearing for said shaft is interposed between said shaft passageway and said auxiliary impeller.

4. The combination as defined in claim 1 in which said heat exchanger includes a heat exchanger housing secured to and extending longitudinally axially from said motor housing closure, said motor housing closure has heat transfer tubes secured thereto and extending therefrom into said heat exchanger housing, and said motor housing closure has inlet openings therethrough in communication with said motor rotor chamber and return openings in communication with said shaft passageway.

5. In a heat exchanger for a motor driven pump having a motor housing with an interior chamber, means for cooling fluid in said housing comprising a housing closure plate for closing an end of said housing having an outwardly extending mounting portion, a heat exchanger housing extending longitudinally from said housing closure plate, said housing closure plate having heat transfer tubes E secured at their ends in said plate and extending into said heat exchanger housing, said housing closure having iluid inlet openings therethrough in communication with said chamber at one location and iiuid iiow openings in communication with said chamber at another location, and means for circulating another iiuid in contact With said heat transfer tubes for heat transfer therefrom.

6. In a heat exchanger for a motor driven pump having a motor housing with an interior chamber and a shaft in said chamber with a longitudinal passageway, means for cooling fluid in said housing comprising a housing closure plate With a portion for closing an end of said housing, said shaft having a longitudinal passageway, a heat exchanger housing secured to said housing closure and extending longitudinally With respect to said shaft and from said housing closure plate, said housing closure plate having a radial bearing therein for supporting said shaft, heat transfer tubes mounted on said housing closure plate and extending into said heat exchanger housing, said housing closure plate having fluid How openings therethrough in communication with said chamber and said tubes and fluid flow openings in communication with said shaft passageway and said tubes, and means for circulating another Huid in contact with said heat transfer tubes for heat transfer therefrom.

7. The combination defined in claim 6 in which an auxiliary impeller is provided on said shaft in said chamber in communication with said shaft passageway for circulation of the cooling fluid.

8. The combination deined in claim 6 in which said housing has a cooling jacket in surrounding relation thereto and said jacket has its interior connected to said last means.

9. A heat exchanger unit for motor driven pumps and the like comprising an end closure having a central outwardly extending mounting portion, a tubular extension on one side thereof With a radial shaft bearing carrying portion therein, said end c-losure having a heat exchanger housing extending from the opposite side thereof, said end closure having spaced openings therethrough for ingress and egress of fluid to be cooled, a plurality of heat exchange tubes mounted on said end closure and extending into said housing in connected relation to said openings, a fluid connection connected to said heat exchanger hous ing for supplying Huid for cooling said heat exchange tubes, and a uid delivery connection for the delivery of the supplied iiuid from said heat exchanger housing.

10. The combination defined in claim 9 in which said heat exchange tubes are U-shaped with their major dimension parallel to the longitudinal axis of said housing, the interior of said housing has a Ilongitudinal bathe plate, and heat exchange tubes are disposed on opposite sides of said bafiie.

References Cited by the Examiner UNITED STATES PATENTS 2,301,113 11/42 Ettington 165-158 X 2,556,435 6/51 Moehrl 310-54 X 2,870,997 1/59 Soderstrom 165-158 X 2,951,165 8/60 Artunoi B10-54 2,964,659 12/ 60 Steele 10S-87 FOREIGN PATENTS 118,109 3/59 Russia.

MILTON O. HIRSHFIELD, Primary Examiner.

LAWRENCE V. EFNER, DAVID X SLINEY,

Examiners. 

1. A HEAT EXCHANGE SYSTEM FOR A MOTOR DRIVEN PUMP HAVING A MOTOR HOUSING WITH CYLINDRICAL SLEEVE LONGITUDINALLY AXIALLY MOUNTED THEREIN AND SEPARATING A MOTOR STATOR CHAMBER FROM AN INTERIOR MOTOR ROTOR CHAMBER, A MOTOR ROTOR IN SAID MOTOR ROTOR CHAMBER HAVING A CLEARANCE WITH RESPECT TO SAID SLEEVE FOR COOLING FLUID FLOW, A SHAFT ON WHICH SAID MOTOR ROTOR IS MOUNTED, SAID SHAFT HAVING A CENTRAL LONGITUDINAL PASSAGEWAY THEREIN FOR COOLING FLUID FLOW, A MOTOR HOUSING CLOSURE AT ONE END OF SAID SLEEVE HAVING A BEARING FOR SAID SHAFT, A HEAT EXCHANGER MOUNTED ON AND LONGITUDINALLY AXIALLY DISPOSED WITH RESPECT TO SAID MOTOR HOUSNG CLOSURE HAVING HEAT EXCHANGE ELEMENTS THEREIN IN COMMUNICATION WITH SAID MOTOR ROTOR CHAMBER AND WITH THE INTERIOR OF SAID SHAFT LONGITUDINALLY THROUGH SAID MOTOR HOUSING CLOSURE, A FLUID CONNECTION FOR SUPPLYING FLUID FOR COOLING SAID HEAT EXCHANGE ELEMENTS, A FLUID DELIVERY CONNECTION FOR THE DELIVERY OF COOLING FLUID FROM SAID HEAT EXCHANGER, AND MEMBERS INTERIORLY DISPOSED IN SAID SLEEVE AND CONTIGUOUS TO THE OTHER END OF SAID SLEEVE FOR IMPELLING FLUID IN SAID CLEARANCE AND THROUGH SAID EXCHANGE ELEMENTS AND SAID SHAFT PASSAGEWAY. 